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53992RECLASSIFY CONTINGENCY19/06/2016 03:37:35 AM
Reclassification of a Non-Credible Contingency Event: Collinsville North - Mackay Tee Proserpine 7125 and 7126 132 kV Lines in Queensland due to Lightning.
AEMO ELECTRICITY MARKET NOTICE
Reclassification of a Non-Credible Contingency Event: Collinsville North - Mackay Tee Proserpine 7125 and 7126 132 kV Lines in Queensland due to Lightning.
Lightning is occurring near the Collinsville North - Mackay Tee Proserpine 7125 and 7126 132 kV Lines.
AEMO considers the simultaneous trip of those circuits to now be more likely.
Therefore AEMO has reclassified this as a credible contingency event from 0335 hrs 19/06/16 until further notice.
Manager NEM Real Time Operations
Reclassification of a Non-Credible Contingency Event: Collinsville North - Mackay Tee Proserpine 7125 and 7126 132 kV Lines in Queensland due to Lightning.
Lightning is occurring near the Collinsville North - Mackay Tee Proserpine 7125 and 7126 132 kV Lines.
AEMO considers the simultaneous trip of those circuits to now be more likely.
Therefore AEMO has reclassified this as a credible contingency event from 0335 hrs 19/06/16 until further notice.
Manager NEM Real Time Operations
53991RECLASSIFY CONTINGENCY19/06/2016 03:01:21 AM
Reclassification of a Non-Credible Contingency Event: Ross - Chalumbin 857 and 858 275 kV Lines in Queensland due to Lightning.
AEMO ELECTRICITY MARKET NOTICE
Reclassification of a Non-Credible Contingency Event: Ross - Chalumbin 857 and 858 275 kV Lines in Queensland due to Lightning.
Lightning is occurring near the Ross - Chalumbin 857 and 858 275 kV Lines.
AEMO considers the simultaneous trip of those circuits to now be more likely.
Therefore AEMO has reclassified this as a credible contingency event from 0300 hrs 19/06/2016 until further notice.
Manager NEM Real Time Operations
Reclassification of a Non-Credible Contingency Event: Ross - Chalumbin 857 and 858 275 kV Lines in Queensland due to Lightning.
Lightning is occurring near the Ross - Chalumbin 857 and 858 275 kV Lines.
AEMO considers the simultaneous trip of those circuits to now be more likely.
Therefore AEMO has reclassified this as a credible contingency event from 0300 hrs 19/06/2016 until further notice.
Manager NEM Real Time Operations
53981POWER SYSTEM EVENTS16/06/2016 11:31:54 AM
Non-credible contingency event - Vic region - 16/06/16
AEMO ELECTRICITY MARKET NOTICE
Non-credible contingency event - Vic region - 16/06/16
At 1106 hrs the following plant tripped.
Loy Yang No. 1 and No. 3 500 kV Bus
Hazelwood - Loy Yang No. 2 500 kV Line
Loy Yang No. 1 500/220 kV Transformer
Loy Yang A1 generating unit
AEMO did not instruct load shedding.
AEMO has not been advised of any disconnection of bulk electrical load.
The cause of this non credible contingency event has been identified and AEMO is satisfied that another occurrence of this event is unlikely under the current circumstances.
AEMO will not reclassify this event as a credible contingency event.
Manager NEM Real Time Operations
Non-credible contingency event - Vic region - 16/06/16
At 1106 hrs the following plant tripped.
Loy Yang No. 1 and No. 3 500 kV Bus
Hazelwood - Loy Yang No. 2 500 kV Line
Loy Yang No. 1 500/220 kV Transformer
Loy Yang A1 generating unit
AEMO did not instruct load shedding.
AEMO has not been advised of any disconnection of bulk electrical load.
The cause of this non credible contingency event has been identified and AEMO is satisfied that another occurrence of this event is unlikely under the current circumstances.
AEMO will not reclassify this event as a credible contingency event.
Manager NEM Real Time Operations
53964RECLASSIFY CONTINGENCY14/06/2016 11:26:00 AM
Cancellation - Reclassification of the loss of Wagga 132kV B bus, the No2 and the No3 330/132kV transformers in NSW region.
AEMO ELECTRICITY MARKET NOTICE
Cancellation - Reclassification of the loss of Wagga 132 kV B bus, the No 2 and the No 3 330/132 kV transformers in NSW region - 14/06/2016.
Refer to Electricity Market Notice 53874 and 53888
Based on advice from the asset owner the circumstances that existed in relation to the tripping of the Wagga substation 132 kV B bus, the No2 and the No3 330/132 kV transformers have now been addressed
Therefore AEMO no longer considers the simultaneous trip of the Wagga substation 132 kV B bus, the No2 and the No3 330/132 kV transformers to be a credible contingency event from 1055 hrs 14/06/2016 .
Manager NEM Real Time Operations
Cancellation - Reclassification of the loss of Wagga 132 kV B bus, the No 2 and the No 3 330/132 kV transformers in NSW region - 14/06/2016.
Refer to Electricity Market Notice 53874 and 53888
Based on advice from the asset owner the circumstances that existed in relation to the tripping of the Wagga substation 132 kV B bus, the No2 and the No3 330/132 kV transformers have now been addressed
Therefore AEMO no longer considers the simultaneous trip of the Wagga substation 132 kV B bus, the No2 and the No3 330/132 kV transformers to be a credible contingency event from 1055 hrs 14/06/2016 .
Manager NEM Real Time Operations
53957RECLASSIFY CONTINGENCY13/06/2016 12:09:39 PM
Update - Reclassification of a Non-Credible Contingency Event in TAS Region
AEMO ELECTRICITY MARKET NOTICE
Update - Reclassification of a Non-Credible Contingency Event in TAS Region:
Trip of any Tasmanian Transmission Line and Basslink Interconnector for Basslink flow in the direction of Victoria to Tasmania
Refer to MN 47360 issued 19/12/2014 and MN 47855 issued 23/01/2015.
Advice provided to AEMO indicates that Basslink is unlikely to trip for 220 kV transmission faults close to George Town. As the George Town to Tamar Valley power station 220 kV lines are very short it is unlikely that Basslink will trip for a fault on these lines.
Based on this advice AEMO has reclassified the loss of any transmission line in Tasmania and Basslink Interconnector to be a credible contingency event for Basslink flow in the direction of Victoria to Tasmania only, except for faults on either of the two George Town to Pacific Aluminium 220 kV transmission lines or the George Town to Tamar Valley power station 220 kV transmission line, from 1151 hrs 13/06/2016 until further notice.
Manager NEM Real Time Operations
Update - Reclassification of a Non-Credible Contingency Event in TAS Region:
Trip of any Tasmanian Transmission Line and Basslink Interconnector for Basslink flow in the direction of Victoria to Tasmania
Refer to MN 47360 issued 19/12/2014 and MN 47855 issued 23/01/2015.
Advice provided to AEMO indicates that Basslink is unlikely to trip for 220 kV transmission faults close to George Town. As the George Town to Tamar Valley power station 220 kV lines are very short it is unlikely that Basslink will trip for a fault on these lines.
Based on this advice AEMO has reclassified the loss of any transmission line in Tasmania and Basslink Interconnector to be a credible contingency event for Basslink flow in the direction of Victoria to Tasmania only, except for faults on either of the two George Town to Pacific Aluminium 220 kV transmission lines or the George Town to Tamar Valley power station 220 kV transmission line, from 1151 hrs 13/06/2016 until further notice.
Manager NEM Real Time Operations
53888RECLASSIFY CONTINGENCY11/06/2016 05:15:46 PM
Reclassification of the loss of Wagga 132kV B bus, No2 and No3 transformer as a credible event 11 June 2016
AEMO ELECTRICITY MARKET NOTICE
Refer AEMO ELECTRICITY MARKET NOTICE 53874
At 0950 hrs on 11/06/16, the Wagga substation 132kV B bus, the No2 and the No3 330/132kV transformers tripped.
The cause of this non credible contingency event is not known at this stage.
AEMO is not satisfied that this non credible event is unlikely to re-occur.
AEMO therefore classifies this event as being a credible contingency event.
The No3 330/132kV transformer and the bus were placed on load from 1430hrs, the No2 330/132kV transformer remains de-energised.
Manager NEM Real Time Operations
Refer AEMO ELECTRICITY MARKET NOTICE 53874
At 0950 hrs on 11/06/16, the Wagga substation 132kV B bus, the No2 and the No3 330/132kV transformers tripped.
The cause of this non credible contingency event is not known at this stage.
AEMO is not satisfied that this non credible event is unlikely to re-occur.
AEMO therefore classifies this event as being a credible contingency event.
The No3 330/132kV transformer and the bus were placed on load from 1430hrs, the No2 330/132kV transformer remains de-energised.
Manager NEM Real Time Operations
53874POWER SYSTEM EVENTS11/06/2016 10:32:06 AM
Non-credible contingency event - NSW region - 11 June 2016
AEMO ELECTRICITY MARKET NOTICE
Non-credible contingency event - NSW region - 11 June 2016
At 0950 hrs the Wagga substation 132kV B bus, the No2 and the No3 330/132kV transformers tripped.
AEMO did not observe any reduction in electrical demand
AEMO did not instruct load shedding.
AEMO has not been advised of any disconnection of bulk electrical load.
The cause of this non credible contingency event is not known at this stage.
Manager NEM Real Time Operations
Non-credible contingency event - NSW region - 11 June 2016
At 0950 hrs the Wagga substation 132kV B bus, the No2 and the No3 330/132kV transformers tripped.
AEMO did not observe any reduction in electrical demand
AEMO did not instruct load shedding.
AEMO has not been advised of any disconnection of bulk electrical load.
The cause of this non credible contingency event is not known at this stage.
Manager NEM Real Time Operations
53705POWER SYSTEM EVENTS08/06/2016 02:45:06 AM
Update - Non-Credible Contingency Event - Vic Region - 8 June 2016
AEMO ELECTRICITY MARKET NOTICE
Update - Non-credible contingency event - Victoria region - 8 June 2016
Update to MN 53704
At 0219 hrs the Yallourn No. 2 220 kV bus was returned to service.
The cause of this non-credible contingency event has been identified and AEMO is satisfied that another occurrence of this event is unlikely under the current circumstances.
AEMO will not reclassify this event as a credible contingency event.
Manager NEM Real Time Operations
Update - Non-credible contingency event - Victoria region - 8 June 2016
Update to MN 53704
At 0219 hrs the Yallourn No. 2 220 kV bus was returned to service.
The cause of this non-credible contingency event has been identified and AEMO is satisfied that another occurrence of this event is unlikely under the current circumstances.
AEMO will not reclassify this event as a credible contingency event.
Manager NEM Real Time Operations
53704POWER SYSTEM EVENTS08/06/2016 01:41:50 AM
Non-Credible Contingency Event - Vic Region - 8 June 2016
AEMO ELECTRICITY MARKET NOTICE
Non-credible contingency event - Victoria region - 8 June 2016
At 0129 hrs the Yallourn No. 2 220 kV bus tripped.
AEMO did not instruct load shedding.
AEMO has not been advised of any disconnection of bulk electrical load.
The cause of this non credible contingency event is not known at this stage.
Manager NEM Real Time Operations
Non-credible contingency event - Victoria region - 8 June 2016
At 0129 hrs the Yallourn No. 2 220 kV bus tripped.
AEMO did not instruct load shedding.
AEMO has not been advised of any disconnection of bulk electrical load.
The cause of this non credible contingency event is not known at this stage.
Manager NEM Real Time Operations